Custom render feature "Assertion failed"

Unity Engine
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1

Hi! I made a render feature with which i want to blit the color from the camera target and do some change and blit it back.

However, the following errors occur in play when I select the material from the project window or even just open the fold that accommodates the material.

Assertion failed
UnityEngine.Rendering.Universal.ScriptableRenderPass:Blit (UnityEngine.Rendering.CommandBuffer,UnityEngine.Rendering.RTHandle,UnityEngine.Rendering.RTHandle,UnityEngine.Material,int)
RFGrid/CustomRenderPass:Execute (UnityEngine.Rendering.ScriptableRenderContext,UnityEngine.Rendering.Universal.RenderingData&) (at Assets/Settings/RenderFeature/RFGrid.cs:36)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

ArgumentNullException: Value cannot be null.
Parameter name: value
UnityEngine.MaterialPropertyBlock.SetTexture (System.Int32 nameID, UnityEngine.Texture value) (at <f335e40f338b47ffbc5bcfa0175ee870>:0)
UnityEngine.Rendering.Blitter.BlitTexture (UnityEngine.Rendering.CommandBuffer cmd, UnityEngine.Rendering.RTHandle source, UnityEngine.Vector4 scaleBias, UnityEngine.Material material, System.Int32 pass) (at ./Library/PackageCache/com.unity.render-pipelines.core@14.0.11/Runtime/Utilities/Blitter.cs:261)
UnityEngine.Rendering.Blitter.BlitCameraTexture (UnityEngine.Rendering.CommandBuffer cmd, UnityEngine.Rendering.RTHandle source, UnityEngine.Rendering.RTHandle destination, UnityEngine.Material material, System.Int32 pass) (at ./Library/PackageCache/com.unity.render-pipelines.core@14.0.11/Runtime/Utilities/Blitter.cs:377)
UnityEngine.Rendering.Universal.ScriptableRenderPass.Blit (UnityEngine.Rendering.CommandBuffer cmd, UnityEngine.Rendering.RTHandle source, UnityEngine.Rendering.RTHandle destination, UnityEngine.Material material, System.Int32 passIndex) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/Passes/ScriptableRenderPass.cs:718)
RFGrid+CustomRenderPass.Execute (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.RenderingData& renderingData) (at Assets/Settings/RenderFeature/RFGrid.cs:36)
UnityEngine.Rendering.Universal.ScriptableRenderer.ExecuteRenderPass (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.ScriptableRenderPass renderPass, UnityEngine.Rendering.Universal.RenderingData& renderingData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/ScriptableRenderer.cs:1507)
UnityEngine.Rendering.Universal.ScriptableRenderer.ExecuteBlock (System.Int32 blockIndex, UnityEngine.Rendering.Universal.ScriptableRenderer+RenderBlocks& renderBlocks, UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.RenderingData& renderingData, System.Boolean submit) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/ScriptableRenderer.cs:1463)
UnityEngine.Rendering.Universal.ScriptableRenderer.Execute (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.RenderingData& renderingData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/ScriptableRenderer.cs:1223)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.RenderSingleCamera (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Rendering.Universal.CameraData& cameraData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/UniversalRenderPipeline.cs:690)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.RenderSingleCameraInternal (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Camera camera, UnityEngine.Rendering.Universal.UniversalAdditionalCameraData& additionalCameraData) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/UniversalRenderPipeline.cs:575)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.RenderSingleCameraInternal (UnityEngine.Rendering.ScriptableRenderContext context, UnityEngine.Camera camera) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/UniversalRenderPipeline.cs:558)
UnityEngine.Rendering.Universal.UniversalRenderPipeline.Render (UnityEngine.Rendering.ScriptableRenderContext renderContext, System.Collections.Generic.List`1[T] cameras) (at ./Library/PackageCache/com.unity.render-pipelines.universal@14.0.11/Runtime/UniversalRenderPipeline.cs:384)
UnityEngine.Rendering.RenderPipeline.InternalRender (UnityEngine.Rendering.ScriptableRenderContext context, System.Collections.Generic.List`1[T] cameras) (at <f335e40f338b47ffbc5bcfa0175ee870>:0)
UnityEngine.Rendering.RenderPipelineManager.DoRenderLoop_Internal (UnityEngine.Rendering.RenderPipelineAsset pipe, System.IntPtr loopPtr, UnityEngine.Object renderRequest, Unity.Collections.LowLevel.Unsafe.AtomicSafetyHandle safety) (at <f335e40f338b47ffbc5bcfa0175ee870>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

The render feature code is

using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;

public class RFGrid : ScriptableRendererFeature
{
    class CustomRenderPass : ScriptableRenderPass
    {
        public Material material;

        RTHandle rtTemp;

        public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData)
        {
            var colorDesc = renderingData.cameraData.cameraTargetDescriptor;
            colorDesc.depthBufferBits = 0;
            RenderingUtils.ReAllocateIfNeeded(ref rtTemp, colorDesc);

            // ConfigureTarget(renderingData.cameraData.renderer.cameraColorTargetHandle, renderingData.cameraData.renderer.cameraDepthTargetHandle);
            // ConfigureClear(ClearFlag.Color, new Color(0, 0, 0, 0));
        }


        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            CommandBuffer cmd = CommandBufferPool.Get();
            using (new ProfilingScope(cmd, new ProfilingSampler("RFGrid")))
            {
                // this makes sure the frame debugger displays everything under the correct title.
                context.ExecuteCommandBuffer(cmd);
                cmd.Clear();

                // main logic
                RTHandle rtCamera = renderingData.cameraData.renderer.cameraColorTargetHandle;
                Blit(cmd, rtCamera, rtTemp, material);
                Blit(cmd, rtTemp, rtCamera);
            }

            context.ExecuteCommandBuffer(cmd);
            cmd.Clear();
            CommandBufferPool.Release(cmd);
        }

        public void Dispose()
        {
            rtTemp?.Release();
        }

    }

    CustomRenderPass m_ScriptablePass;
    [SerializeField] Material material;

    /// <inheritdoc/>
    public override void Create()
    {
        m_ScriptablePass = new CustomRenderPass() { material = material };
        m_ScriptablePass.renderPassEvent = RenderPassEvent.BeforeRenderingOpaques;
    }


    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        m_ScriptablePass.ConfigureInput(ScriptableRenderPassInput.Color);
        renderer.EnqueuePass(m_ScriptablePass);
    }

    protected override void Dispose(bool disposing)
    {
        m_ScriptablePass.Dispose();
    }
}

The material is just a default full-screen shader graph.

image
image940×839 32 KB
T

This is the renderer setting

image
image485×877 40.8 KB

This is the URP asset
image

1 Like
2

Hi!
We just had the same issue and noticed it happens because the render pass can’t be applied to the camera from the Preview panel.
Specifically it appears like RTHandle gets casted to a Texture, which in a Preview panel returns null for some reason (The cast used in Blit)
Check if the camera type is not Preview worked for us, something like this if you want it to apply exclusively to Game view:

if (renderingData.cameraData.cameraType == CameraType.Game)
{
    renderer.EnqueuePass(m_ScriptablePass);
}